HTTP 101 Switching Protocols vs 304 Not Modified
HTTP 101 (Switching Protocols) is a 1xx Informational response, while 304 (Not Modified) is a 3xx Redirection response. 101 indicates that the server understands the Upgrade header field request and indicates which protocol it is switching to. In contrast, 304 means that the resource has not been modified since the last request. The client can use its cached copy.
คำอธิบาย
The server understands the Upgrade header field request and indicates which protocol it is switching to.
เมื่อคุณพบเห็น
When upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
วิธีแก้ไข
This is normal behavior during protocol upgrades. Ensure your client supports the target protocol.
คำอธิบาย
The resource has not been modified since the last request. The client can use its cached copy.
เมื่อคุณพบเห็น
When the browser cache is still valid (If-None-Match / If-Modified-Since headers match).
วิธีแก้ไข
No fix needed. This saves bandwidth by confirming the cached version is still current.
ความแตกต่างหลัก
101 is a 1xx Informational response, while 304 is a 3xx Redirection response.
HTTP 101: The server understands the Upgrade header field request and indicates which protocol it is switching to.
HTTP 304: The resource has not been modified since the last request. The client can use its cached copy.
You encounter 101 when when upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
You encounter 304 when when the browser cache is still valid (If-None-Match / If-Modified-Since headers match).
ควรใช้อันไหนเมื่อไร
For 101 (Switching Protocols): This is normal behavior during protocol upgrades. Ensure your client supports the target protocol. For 304 (Not Modified): No fix needed. This saves bandwidth by confirming the cached version is still current.